660605272769 has 4 divisors (see below), whose sum is σ = 711421062996. Its totient is φ = 609789482544.

The previous prime is 660605272759. The next prime is 660605272813. The reversal of 660605272769 is 967272506066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 378362772544 + 282242500225 = 615112^2 + 531265^2 .

It is a cyclic number.

It is not a de Polignac number, because 660605272769 - 2¹⁶ = 660605207233 is a prime.

It is a super-2 number, since 2×660605272769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660605272759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25407895094 + ... + 25407895119.

It is an arithmetic number, because the mean of its divisors is an integer number (177855265749).

Almost surely, 2^660605272769 is an apocalyptic number.

It is an amenable number.

660605272769 is a deficient number, since it is larger than the sum of its proper divisors (50815790227).

660605272769 is a wasteful number, since it uses less digits than its factorization.

660605272769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50815790226.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 660605272769 in words is "six hundred sixty billion, six hundred five million, two hundred seventy-two thousand, seven hundred sixty-nine".